Support "History > Reopen Last Closed Window" in Safari

[tedmiston]

There was support for this with the previous approach to closing tabs:

tell application "Safari"
    activate
    tell application "System Events"
        keystroke "w" using {command down, shift down}
    end tell
end tell

vs current approach:

on closeTabs(sourceWindow)
    using terms from application "Safari"
        tell application sourceBrowser to close sourceWindow
    end using terms from
end closeTabs

But at the tradeoff of being uglier and less robust. Something to keep in mind for now.